how old is your little one?
Last time I went to Busch Gardens (last April). I didn't go on a single roller coaster. Only did the water rides. There is so much to do with the animals though. For about $35 (i think) you can go in the back of a truck through the open plains exhibit and feed giraffes and zebras and get right up close to a whole bunch of different animals.
But of course if you have the disney park hopper pass, it makes way more sense financially to just do Animal Kingdom as your florida animal park one, even though it is not nearly as good.